Cylinder machine



" B. POHLER CYLINDER MACHINE Jan. 11, 1938..

2 SheetS-Sheet 1 Filed July 14, 1934 Jan. 11, 1938. B. POHLER CYLINDER MACHINE Filed July 14, 1934 2 Sheets-Sheet 2 Patented Jan. 11, 1938 CYLINDER MACHINE Bruno Piihler, Kamenz, invvsaxony, Germany Application July 14, 1934, Serial No. 735,183 In Germany July. 15, 1933.

V '1' 2Clairns. (o1. 101-282) This invention relates to a 'cylindenmachine provided with a two-revolution impression cylin- "Jder and front delivery of the printed sheets.

' l The invention aims at avoiding; the drawbacks connected with the'kn'own types of stop-cylinder and two revolution machine's-andof uniting all the advantageous features of thsetwo kinds of machinesfin one-machine. To attain its'iobjec't the invention provides that the' seco'nd revolution of the impression cylinder is effected independently of the length of travel of the carriage causing the first revolution ofithe impression cylinder by means of a special additional member, such as a specially driven toothed segment or a horizontally operating rack.

In the cylinder machine according to the invention the sheets to be printed are fed while the impression cylinder "is in a position of rest whereby absolutely accurate feeding is insured and correct register is attained in color work. The machine according to the invention requires little space, less even than a stop-cylinder machine, is available at a low initial price, simple to operate and provided with front delivery of the printed sheet to prevent slurring. The machine parts are not subjected to abnormal stresses and wear.

'By way of example, the invention is illustrated in the accompanying drawings, in whichFigure 1 is a side view of the 'machineyand Fig. 2, a side view of the machine in another position.

Referring to the drawings, I is the main drive which actuates the crank shaft 2. The carriage wheel 3 is moved to and fro by the connecting rod 4 and the transmission levers ,5, 6, so that the rod 4 has a shorter path to travel and the gearing of the crank shaft 2 will be correspondingly lower whereby it becomes possible to make the machine shorter and lower.

The driving lever for the carriagewheel operates in an almost horizontal position, so that the type bed is not subjected to shocks.

The carriage wheel 3 rotates between the racks 8 and 9, the rack Bbeing stationary whereas the rack 9 is secured below the carriage 10 to which the rack H is attached. The impression cylinder I2 is positively rotated during the ad- Vance of the carriage Ill, owing to the engagement of the rack H with the toothed rim l3 arranged on it. Independently of this rotation, a second rotation of the cylinderis effected by separate means comprising a toothed member which may be a toothed segment M or a horizontally operating rack or the like.

M disposed on the fulcrum I5 is rotated by means speed as the latter.

The toothed segment 2 of the lever 'Hi'and the eccentrics i! and i8. By

means of the eccentric i9 and the roller lever 29 fixed on'the pivot 2! the toothed segment l4 arranged on the fulcrum I5 is raised and lowered and brought into and out of engagement with the gear 22 firmly" connected with the impression cylinder |2- which is thus rotated a second time.

The process of printing a sheet is not composed of two operating periods or steps as in stop, :cylinder machines, but divided into three steps which are equally spaced as to time. The first step consists in guiding the sheet by hand or suitable automatic means to the cylinder and causing the'grippers to hold it while the impression cylinder stops. At the beginning of the second step the toothed segment l4 starts ata gradually increasing speed the rotation of the cylinder l2 (Fig. 1). When the latter, after a short travel, has attained normal carriage speed, the rack of 'the advancing carriage engages the toothed rim of the cylinder. For a short distance, the toothed segment l4 and the rack ll of the car riage II] will jointly rotate the cylinder [2. After the rack ll of the carriage III has, so to speak, taken over the cylinder l2, the toothed segment l4 will be lowered so as to become unmeshed and the carriage l 0 willcontinue to move the cylinder l2 until a full revolution is effected during which the sheet is printed.

In the meantime, the toothed segment M, by 1 means of the lever and eccentric transmission as described and as shown in Fig. 2, has been placed in opposite position by being moved under and past the toothed rim 22 of the impression cylinder. Shortly before the first revolution of the impression cylinder 52 has been completed, the toothed segment l4 engages again the toothed rim 22 and cooperates for a short time with the rack ll of the carriage H1 at the same During this movement the toothed segment l4 takes over the impression completion of the second revolution, so that the rack ll of the carriage l0 cannot collide with the toothed rim l3 of the impression cylinder During completion of the second revolution of the impression cylinder I2 a sloW retarded motion has been imparted, to the toothed segment I4 a The carriage II] has thus returned to initial 7 1 position (Fig. 1).

by the corresponding eccentric to insure soft stopping of the cylinder in contrast with stopcylinder machines in which it is suddenly held up by the cylinder brake or catch.

Shortly before the first revolution of the cylinder l2 has been completed, the printed sheet is passed with the printed side up over the delivery roller 24 to the pile table 6|, whereby an object hitherto reserved to the two-revolution machines has been attained also.

In view of this motion and arrangement of the drive for the impression cylinder it is necessary to dispose the inking apparatus behind the impression cylinder, i. e., under the feed table.

I claim:-

1. A drive in cylinder machines, comprising a carriage, a rack for said carriage, an impression cylinder, a multilated toothed rim on the circumference of said cylinder, said rim being engaged by said rack to bring about a revolution of the impression cylinder, a second toothed rim on said impression cylinder, a movably disposed toothed segment, means comprising eccentrics and a roller lever for lifting and lowering said toothed segment and additional eccentrics and a lever for imparting to said toothed segment a slowly starting and stopping oscillatory motion and bringing it into engagement with the second toothed rim on the impression cylinder to alternately rotate the cylinder with said carriage,

whereupon said toothed segment by said means initiates slow rotation of the impression cylinder and the rack engages the other toothed rim on the impression cylinder and said toothed segment by said means is lifted out of the second rim and the carriage alone completes the first rotation of the impression cylinder and before completion of the first revolution of the impression cylinder the toothed segment by said means engages again the second toothed rim and causes the second revolution of the impression cylinder, said means retarding the motion of the toothed segment to gradually stop the impression cylinder after the second revolution, said carriage and rack returning to initial position under and past the mutilated portion of said first toothed rim.

2. A cylinder machine with front delivery of sheets, comprising an impression cylinder having two toothed rims at its circumference, a reciprocating carriage, a rack for said carriage, a toothed gear member and means for alternately raising and lowering said toothed member and imparting oscillatory motion thereto to cause said rack and toothed member alternately to engage the toothed rims of the impression cylinder, the to and fro motion of the carriage corresponding to three circumferences of the impression cylinder at two revolutions thereof.

BRUNO P6I-ILER. 

